Aerosol-Generating Tobacco-Containing Composition Comprising Medium-Chain Triglyceride

ABSTRACT

An aerosol-generating tobacco-containing composition, preferably provided in a form of a foam or mousse, and an aerosol-generating article including the composition, are provided. The composition includes particulate tobacco material and lipid, wherein the lipid is medium-chain triglyceride, and a ratio of the medium-chain triglyceride to the particulate tobacco material on a dry weight basis is between 1:3 and 1:5.

TECHNICAL FIELD OF THE INVENTION

Present invention relates to an aerosol-generating tobacco-containingcomposition comprising tobacco material comprising aerosol-generatingmaterial and medium-chain triglycerides and an aerosol-generatingarticle comprising such composition, in particular a heat-not-burn typesmoking article.

BACKGROUND OF THE INVENTION

A number of prior art documents related to aerosol-generating articlesand its devices have disclosed the use of such articles as a new form ofsmoking. Such devices include for example electrically heatedaerosol-generating devices in which an aerosol is generated by thetransfer of heat from a heating element of the aerosol-generating deviceto aerosol-generating substrates or materials.

Tobacco material which has been homogenised is often used in theproduction of tobacco products. Parts of tobacco plants that are lesssuited for the production of cut filler such as tobacco stems or tobaccodust are typically materials used for homogenised tobacco material.Examples of common forms of homogenised tobacco material are for examplepowder form, reconstituted tobacco sheet and cast leaf.

It has been reported that in heat-not-burn aerosol-generating articles,aerosol-forming substrate is heated at a rather relatively lowtemperature, for instance below 350° C., to avoid combustion thereof. Acharge of inhalable aerosol can then be released from theaerosol-generating article.

The aerosol released is originated from the aerosol formers, which areincorporated into the tobacco material, which may be particulated orgranulated. In order to be released, these aerosol formers have to bemigrated from within the body of the homogenised tobacco material tosurfaces of the homogenised tobacco material. During this process, othervolatile compounds such as nicotine migrate in a similar fashionoutwardly from the body of the homogenised tobacco material, andeventually be released in the charge of aerosol.

Document WO 2017/077112 A1 relates to a homogenised tobacco materialcomprises tobacco and lipid having a melting point between 50° C. and150° C. It was disclosed therein that homogenised tobacco materialcomprises the meltable lipid component advantageously allow less tobaccoto be used while providing an equivalent nicotine or aerosol yield.Moreover, the inclusion of the meltable lipid component also allows themigration of aerosol-formers and other volatile compounds within thehomogenised tobacco material to the surface area of the tobaccomaterial. Nevertheless, these advantages come in the expense of the factthat side-tastes and off odours resulted from the meltable lipidcomponent cannot be completed avoided.

It would therefore be desirable to provide an aerosol-generatingtobacco-containing material for an aerosol-generating article which doesnot give unpleasant smell or taste to consumers. Moreover, it would beparticularly desirable to improve delivery of volatile compoundsincluding nicotine, and particularly when operating at lowertemperatures. In addition, it would also be desirable to provide anaerosol-generating article having a homogenised tobacco material in newform which is suitable for the delivery of volatile compounds.

SUMMARY OF THE INVENTION

The inventors of the present invention have found solutions to theabove-discussed problems through the aerosol-generatingtobacco-containing composition as defined in the claims.

A first aspect of the invention is accordingly to provide anaerosol-generating tobacco-containing composition provided in form or afoam or a mousse, wherein the composition comprises particulate tobaccomaterial and lipid, wherein the lipid is medium-chain triglyceride, theratios of the medium-chain triglyceride to the tobacco-containingmaterial on a dry weight basis are between 1:3 and 1:5.

A second aspect of the invention is accordingly to provide anaerosol-generating article comprising the aerosol-generatingtobacco-containing composition provided in form or a foam or a mousseaccording to the present invention.

A third aspect of the invention is accordingly to provide a method ofpreparing an aerosol-generating tobacco-containing foam or mousse,comprising the steps of: (a) Mixing an aerosol-forming agent, afoam-forming agent and optionally a solvent, under heating; (b) Aeratingthe mixture with a gas or air for at least 5 minutes under roomtemperature; (c) Adding to the mixture a tobacco-containing ingredientand/or inhalable agent; (d) Optionally aerating the mixture with a gasor air; (e) Adding to the mixture a medium-chain triglyceride, whereinthe ratios of the medium-chain triglyceride to the tobacco-containingmaterial on a dry weight basis are between 1:3 and 1:5; (f) Aerating themixture with a gas or air for at least 5 minutes under room temperature;(g) Adding a foam stabilizing agent.

The inventors of the present invention have found out that theaerosol-generating tobacco-containing composition, more prominently whenbeing provided in form of a foam or mousse, unexpectedly solves theproblem of side-tastes and off odours of the homogenised tobaccomaterial where lipids are being used. The inventors found out thatmedium-chain triglyceride (MCT) is a better option to be mixed with thehomogenised tobacco material compared to lipid, as the MCTs are highlyregarded for their clean organoleptic quality. They are odourless andtasteless; hence they do not contribute any off-notes to products.

In addition, the inventor found out that when the ratios of the MCTs tothe homogenised tobacco material on a dry weight basis are between 1:3and 1:5, the porosity of the composition not only increasessignificantly and the texture of the product obtained is fluffier, theflavour and aroma of the tobacco, which is highly sought after by theconsumer, also increases significantly. Interestingly, these effects arenot being observed when the ratio of the MCTs to the homogenised tobaccomaterial on a dry weight basis is outside of these range i.e. more than1:5 or less than 1:3.

For instance when the MCTs is less than 20% by weight from the totalweight on a dry weight basis, regardless of the final amount of thetobacco-containing material, these effects (porosity and fluffiness ofthe composition and stronger tobacco flavour (e.g. when in form of amousse or a foam) as mentioned above have not been optimal, as fewervolatile compounds are being released along with the charge of aerosol.The stronger tobacco flavour and aroma obtained in this invention isattributed to the MCTs. MCTs are widely used in the flavour industrybecause of their superior organoleptic quality and solvent capabilities.Moreover, MCTs is also superior in extracting flavouring. Most probablyfor this reason, higher percentage of MCTs i.e. ratio between MCTs andtobacco-containing material is at least 1:5 but less than 1:3, thestronger tobacco aroma and flavour can instantly be noticed by theconsumer when in use, as these ratios of the MCTs to tobacco has goodporosities in the end products such that higher amount of volatilecompounds from the aerosol-generating substrate can be released alongwith the charge of aerosol. Moreover, it has been found out by theinventors that the aerosol-generating tobacco-containing composition asclaimed presently generally has a micropore size of less than 2 nm andthe general fluffiness of the composition is between 1-3 g/cm³. Thanksto these features of the composition, the aerosol-generating articlecomprising these compositions are immediately distinguishable fromothers and hence are preferred choice.

In one particular preferred embodiment, the ratio of the medium-chaintriglycerides to tobacco-containing material on a dry weight basis is1:3. This embodiment is most preferred as the volatile compounds such asnicotine delivery rate is found to be the highest compared to all othersamples having different ratios. The inventors of the present inventionhave found out that when the ratio of MCTs and tobacco-containingmaterial on a dry weight basis is 1:3, the porosity and texture of theaerosol-generating materials of the end products is in an optimalcondition (e.g. a mixture of open pored foam and closed-cell foam) tohave most of the volatile compounds released in the aerosol.

In one particularly preferred embodiment, the composition is provided inform of a foam or a mousse. Compared to other forms where the materialsare provided for example in the form of reconstituted tobacco sheet orpowder, when the aerosol-generating material are provided in the form ofa foam or a mousse, the volume of the porous microstructure of the foamis enhanced by the usage of MCTs, especially when the ratio of MCTs andtobacco-containing material on a dry weight basis is 1:3. In thisconnection, it is disclosed herein that foam-forming agent and thefoam-stabilizing agent are involved in the formation of the foam as wellas maintaining of the foam microstructure.

To this end, it is reiterated that the present invention in form of afoam or a mousse can be applied in all other embodiments discussedherein.

According to one embodiment, the mixture is aerated in each step with aheated gas or air of between 35° C. and 50° C. for at least 10 minutes.Such elevated temperature increases the texture, consistency andnicotine delivery of the aerosol-generating tobacco-containing foam ormousse compared to products made of powder form for instance. Moreover,the volume of the porous microstructure of the foam can be enhanced bythe usage of MCTs under such temperature.

In another preferred embodiment, the aerosol-generatingtobacco-containing composition comprising the medium-chain triglycerideis aerated for at least 5 minutes, preferably at least 10 minutes, underroom temperature. The aeration step mentioned herein increases thevolume of the porous microstructure of the aerosol-generating materialof the present invention.

According to one embodiment, the particulate tobacco material has aparticle size of less than 100 μm, preferably less than 90 μm, 80 μm, 70μm, 60, μm or 50 μm, more preferably between 40 μm and 90 μm. When theparticle size of the tobacco-containing material is provided to be lessthan 100 μm, the aerosol-generating material of the present inventionwhich consists predominantly of the tobacco materials will have ahomogenised tobacco particle size. Furthermore, due to the smallparticle size, the amount of surface area per unit volume of homogenisedtobacco material is also increased. The volatile compounds from theaerosol-generating material can thus be released easily and moreefficiently in the aerosol.

According to another embodiment, the lipid is derived from palm kerneloil or coconut oil.

In yet another embodiment, the lipid consists of caprylic acid (C8:0),capric acid (C10:0) and/or preferably lauric acid (C12:0).

In another preferred embodiment, over 50 wt.-%, preferably over 60 wt.-%or 66 wt.-% of the lipid are MCT caprylic acid (C8:0) based on the totalweight of the lipid.

According to another embodiment, the composition further comprisesmaltodextrin acacia gum, silicon dioxide and/or sunflower lecithin.

In one further embodiment, the composition comprises any of apropellant, an aerosol-forming agent, a foam-stabilizing agent, and/or afoam-forming agent.

According to a further embodiment, the composition comprises anaerosol-forming agent in a proportion of 10-80 wt.-%, preferably 30-70wt.-% of the weight of the aerosol-generating material.

By “about” or “approximately” in relation to a given numerical value, itis meant to include numerical values within 10% of the specified value.All values given in the present disclosure are to be understood to becomplemented by the word “about”, unless it is clear to the contraryfrom the context.

The indefinite article “a” or “an” does not exclude a plurality, thusshould be treated broadly.

Unless defined otherwise, technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe art to which this invention belongs.

A tobacco-containing material can be any compound, mixture, particlematter, and/or solution that contains and/or carries a constituent oftobacco, either artificially included or naturally contained in tobacco,e.g. tobacco, tobacco particles, tobacco flavor and/or nicotine. Incontrast, an example for an artificially added non-tobacco-specificflavor would be menthol.

As used herein, the term “aerosol-generating article” refers to anaerosol-generating article for producing an aerosol comprising anaerosol-generating material that is intended to be heated rather thancom busted in order to release volatile compounds that can form anaerosol.

As used herein, the term “aerosol-generating material” refers to amaterial, upon heating, capable of releasing volatile compounds, whichcan form an aerosol. The aerosol generated from aerosol-generatingmaterial of aerosol-generating articles described herein may be visibleor invisible and may include vapours (for example, fine particles ofsubstances, which are in a gaseous state, that are ordinarily liquid orsolid at room temperature) as well as gases and liquid droplets ofcondensed vapours.

As used herein, the term “medium-chain triglyceride” is used to definean oil comprising one or more triglycerides, each triglyceride havingtwo or three fatty acid chains having a chain length of between 6 and 12carbon atoms. The fatty acid chain may therefore include one or more ofcaproic acid (C6), caprylic acid (C8), capric acid (C10) and lauric acid(C12). These can be present in the medium-chain triglyceride oil in anycombination and in any relative amounts, provided the requiredproperties of the medium-chain triglyceride oil are obtained. For eachtriglyceride within the medium-chain triglyceride oil, the three fattyacid chains may have the same length as each other or a differentlength, provided at least two of the fatty acid chains has a chainlength of between 6 and 12 carbon atoms. For each triglyceride, thethree fatty acid chains may be identical, or two or more of the fattyacid chains may be different to each other. The triglycerides mayindividually be saturated or unsaturated.

As used herein, the term “homogenised tobacco material” encompasses anytobacco material formed by the agglomeration of particles of tobaccomaterial, along or in a mixture with other plant materials. For example,the homogenised tobacco material may be provided in granulated (powder)form, or it can be provided as sheets or webs of homogenised tobaccomaterial by agglomerating particulate tobacco material obtained bygrinding or otherwise powdering of one or both of tobacco leaf laminaand tobacco leaf stems. In addition, homogenised tobacco material maycomprise a minor quantity of one or more of tobacco dust, tobacco fines,and other particulate tobacco by-products formed during the treating,handling and shipping of tobacco. The homogenised tobacco material mayalso be provided in small particle size e.g. less than 100 μm such asclaimed presently, and subsequently be used to constitute for theaerosol-generating material, which can be in form of a foam or a mousse.

An aerosol-forming agent can be any compound, mixture and/or solutionthat is capable of forming an aerosol, e.g. when heated and/or inmixture with a tobacco ingredient containing agent. Well known examplesinclude humectants such as glycerin and propylene glycol, otheralcohols, such as ethanol, etc.

An open pored foam as used herein is to be understood as a foam whichcan be considered as being formed of a plurality of interconnectingpores (formed out of a structural material derived from the foam formingagent cooperating with the interacting components such as the foamstabilizing agent, solid components such as tobacco particles and somesolvent, etc.) which are able to contain fluid, in particular a mixtureof humectant/liquid aerosol-forming substrate and air, wherein at leasta significant portion (e.g. greater than 50% by volume) of the pores inthe foam are fluidly connected with each other, contrary to aclosed-cell foam, wherein the majority of the pores form discretepockets, each completely enclosed by pore-forming material so as tosubstantially prevent fluid from passing freely between pores. It iscurrently believed that the mousses formed as described herein arelargely open-pored mousses because after cooling or heating of theaerosol-generating material comprising the MCTs, vapour is released fromthe mousse, substantially all of the humectant appears to be releasedbased on measuring of the weight of the mousse portion before and afterheating, which could not be readily explained if the humectant was notable to travel through neighboring pores to reach the surface of themousse portion. However, alternative explanations cannot be totallyexcluded—for example closed pores could perhaps be opened by rupturing aclosed cell wall as a result of the pressure of vaporized gas, etc.

An electronic cigarette (e-cigarette) or similar devices like electronicpipes or heat-not-burn devices, as referred to in the present invention,are not particularly limited, and may be used to provide a user with anaerosol to inhale. It can, according to certain embodiments, comprise amouthpiece, a heater, a receiving portion, e.g. a pod, stick, capsuleand a casing.

As used herein, the term “melting point” refers to the clear point orcomplete melting point of the medium-chain triglyceride. Thiscorresponds to the temperature, in degrees Celsius, at which the oil isfully liquid and completely clear with no solid particles remaining.Many methods known in the art can be used to measure the clear pointmelting point of an oil, for example, the capillary technique or StuartSMP50 melting point apparatus.

As used herein, wt.-% is to be understood as weight percent, based onthe total weight of the substance on a dry basis, unless explicitlyotherwise specified. In the present disclosure, all amounts are given inwt.-%, unless clearly stated otherwise or obvious from context. In thepresent disclosure, furthermore all amounts given in wt.-% add up to 100wt.-%. The weight percent are thereby calculated by dividing the mass ofeach component by the total mass e.g. of the foam, unless indicatedotherwise or clear from context.

DETAILED DESCRIPTION OF THE INVENTION

Present invention relates to an aerosol-generating a tobacco-containingcomposition, comprising a lipid in form a medium-chain triglyceride(MCTs) oil. The composition can be provided in many forms such as one ormore sheets of homogenised tobacco material or be provided in form of afoam or a mousse or powder, wherein the ratios between the MCTs and thetobacco-containing material on a dry basis is between 1:3 and 1:5. It isemphasized herein that the present invention is not restricted in thesetwo forms, other forms such as powder form, gel, or coating theaerosol-generating material of the present invention on a carrier wouldalso be possible.

Due to the fact that MCT has a melting point around 20° C., the MCT asdiscussed in the present invention therefore always exists in acompletely liquid form at room temperature (e.g. 22-24° C.). Thehomogenised tobacco material therefore includes the MCT oil in liquidform dispersed within a matrix (solid or semi-solid such as foam or gel)of the tobacco-containing material.

The MCTs used in the present invention is commercially available. Forexample it is obtained from the Sensory Effects Company (Product ID:Richmix 5025 IP(175755)), comprising a 52% fat MCT oil powdered creamermade from palm-derived, palm kernel and/or coconut based fatty acids.According to the product description, maltodextrin and acacia gum,silicon dioxide and sunflower lecithin are also comprised in saidproduct. Said MCTs have a melting point significantly below 20° C.,wherein the ratio of the MCT C6:C8:C10:C12 is approximately 1:20:10:1.In other words, the content of C6 and C12 in the MCTs used in thepresent invention is negligible.

To this end, it is reiterated that any commercially available MCTs wouldbe suitable to be used in the present invention, as long as thecommercially available products meet the criteria and being sold asmedium-chain triglycerides oil.

The use of a medium-chain triglyceride oil having a melting point below20° C. such that the oil is liquid at room temperature also providesadvantages to the manufacture of the homogenised tobacco material. Forexample, since the MCT oil exists naturally as a liquid at the roomtemperature, compared to other lipids such as wax, MCT oil does notrequired to be heated and melted. The homogenised tobacco material whichderived usually from a pulp does not need to be heated in order toretain the oil in liquid form. The manufacturing process can thereforebe carried out without the need for external heating. This not onlysimplifies the manufacturing process but it also avoid the loss ofvolatile compounds from the tobacco-containing material during theexternal heating process. Moreover, the use of MCTs in the homogenisedtobacco materials also solves the stickiness problem as typically foundaerosol-generating article where lipids are being used in themanufacturing process. The stickiness characteristic of lipid preventsvolatile compounds to be released efficiently compared to MCTs.

The inventors of the present invention have found out from the testresults that when the ratios of MCT to tobacco material on a dry basisare between 1:3 and 1:5, MCT works best in extracting volatile compoundsfrom the tobacco-containing material. It has been found out that inthose samples, not only the side tastes and off odour which typicallyexist in lipid-containing samples (e.g. wax) is no longer noticeable, italso gives the strongest tobacco aroma and flavours to the consumers, aswell as the highest nicotine delivery.

The diffusivity of volatile compounds, such as aerosol formers andnicotine, is greater in a liquid phase than in a solid phase. The liquidmedium-chain triglyceride will therefore act to facilitate the transferof volatile compounds within the particulate tobacco material to itssurface. As such, the transfer of these volatile compounds from thegranulated tobacco material to an aerosol may be enhanced in comparisonwith a homogenised tobacco material that does not contain the liquidmedium-chain triglyceride oil within the specific claimed ratios.Interestingly, the inventors found out that when the ratios of MCT totobacco material on a dry basis is outside of the claimed ranges of 1:3and 1:5, the samples are immediately recognisable as less preferredchoices. This is especially obvious when the samples contain a ratio of1:10 or less of MCT to tobacco material on a dry basis, where these lesspreferred samples can be recognised immediately. It is thereforeconcluded that a certain minimum threshold of percentage of MCT totobacco materials are needed in order to have the volatile compounds tobe optimally extracted and be released as aerosol, as it allows for theformation of a good mixture of open pored foam and closed cell foam.

The medium chain triglyceride oil is preferably evenly distributedthroughout the tobacco-containing material, which means that at roomtemperature there are no separately distinguishable regions of oil andplant material. Rather, the oil and particles are fully homogenised orgranulated.

The use of a homogenised tobacco material having a medium-chaintriglyceride oil incorporated into it, as described herein, may allowequivalent nicotine or aerosol yields at a lower heating temperaturecompared to the use of a homogenised tobacco material without a mediumchain triglyceride oil as defined. In fact, it has been surprisinglyfound that the use of a particulated tobacco-containing material with amedium-chain triglyceride at a certain ratio as defined herein mayprovide a higher nicotine or aerosol yield at a lower heatingtemperature than is provided by the same material at a higher heatingtemperature. The potential use of a lower heating temperature mayprovide a number of benefits when the composition of the invention, asit is meant for, is used in aerosol-generating devices such asheat-not-burn for instance. For example, a lower temperature ofoperation may allow for longer periods of use of the aerosol-generatingdevice without the need to recharge a battery. As a further example, alower temperature of operation may allow for use of a smaller battery.As a further example, a lower temperature of operation may reduce theliberation of undesirable aerosol constituents from the homogenisedtobacco material.

EXAMPLES 1

An aerosol-generating tobacco-containing composition according to theinvention has been prepared from tobacco material mixed with MCT oil.The resulting composition forms an aerosol-generating material, which inthis example is provided in powder form, each having differentpercentage/ratio of compositions and have been tested, using a method asdescribed herein:

TABLE 1 Aerosol-generating material provided in powder form havingdifferent ratios of MCT to tobacco-containing material on a dry basis.Powder Powder Powder Powder Powder A B C D E Component wt.- % wt.- %wt.- % wt.- % wt.- % Tobacco 60 60 60 60 60 MCT oil 0 30 20 12 6Glycerine 18.5 3.5 8.5 12.5 15.5 Propylene Glycol 18.5 3.5 8.5 12.5 15.5Guar 2 2 2 2 2 Cellulose fibres 1 1 1 1 1

The MCT oil used for Powders B, C, D and E was Richmix 5025 IP (175755)which was obtained from Sensory Effects®, a subsidiary of BalchemCompany. For each tobacco sample, the powder/particulated tobacco wasformed into an aerosol-generating substrate, using conventionaltechniques. The aerosol-generating articles incorporating Powders B, C,D and E are provided according to the present invention, withmedium-chain triglyceride oil in the tobacco-containing material. Theaerosol-generating article incorporating Powder A, which does notinclude the medium-chain triglyceride oil, is a control sample for thepurposes of comparison.

Examples of cellulose fibres could be for instance Cekol® 2000, whereasthe guar could be for instance gellan gum food grade.

Each aerosol-generating article was subjected to the heating testdefined above, at both 360° C. and 280° C. The nicotine level in theaerosol delivered from each aerosol-generating article were measured,with the results shown in Table 2 below.

The nicotine level was measured using the ISO method which is used tomeasure the tar, nicotine and carbon monoxide (TNCO) contents incigarettes and are determined using a smoking machine, which smokes acigarette in accordance with an established method. In the EU thismethod is widely known as ISO method, as set out by the EuropeanCommission. It is mentioned herein that other methods such as Canadianintense method can also be used in the measurement.

TABLE 2 Nicotine delivery efficiency under two different heatingtemperatures. Nicotine Nicotine Ratio of delivery at % delivery at %MCT:Tobacco 360° C. (mg) change 280° C. (mg) change  0 (Pow. A) 1.15 0.71:2 (Pow. B) 1.41 22.61% 0.91 30.00% 1:3 (Pow. C) 2.05 78.26% 1.3187.14% 1:5 (Pow. D) 1.82 58.26% 1.22 74.29% 1:10 (Pow. E)  1.30 13.04%0.89 27.14%

As can be seen from Table 2, an increase in the delivery of nicotinefrom the aerosol-generating tobacco-containing composition was observedin all of the aerosol-generating articles which has incorporated themedium-chain triglyceride in the tobacco-containing material, relativeto the control sample (Powder A). Nevertheless, only the samples inPowders C and D show the most significant improvement in nicotinedelivery. This proves that volatile compounds can efficiently bereleased when the optimal ratios of MCT to tobacco-containing materialare being selected. Amongst these ratios, the ratio of 1:3 being themost promising candidate by showing 78% and 87% increment of nicotinedelivery compared to the control sample (Powder A), when being heatedunder 360° C. and 280° C., respectively. Surprisingly, it was observedthat a lower heating temperature (e.g. 280° C.) encourages the releaseof higher amount of nicotine in the aerosol as compared to those sampleswhere the aerosol-generating substrates (tobacco-containing composition)are being heated at 360° C.

EXAMPLES 2

The same experiments were repeated on the aerosol-generatingtobacco-containing composition of the present invention, whereby theaerosol-generating tobacco-containing compositions in this example arebeing provided in form of a foam or a mousse. The foam characteristicand its manufacturing is known in the art, for example as described inthe patent document WO 2018/122375 A1, with the exception that the MCTsand its ratio to tobacco-containing material were used in the presentinvention.

Other than the fact that the aerosol-generating tobacco-containingcomposition is provided in form of a foam, all other parameters weresimilar to those as described in the Example 1.

TABLE 3 Aerosol-generating material provided in form of a foam or amousse having different ratios of MCT to tobacco-containing material ona dry basis. Foam M Foam N Foam O Foam P Foam Q Component wt.- % wt.- %wt.- % wt.- % wt.- % Tobacco 60 60 60 60 60 MCT oil 0 30 20 12 6Glycerine 18.5 3.5 8.5 12.5 15.5 Propylene 18.5 3.5 8.5 12.5 15.5 GlycolGuar 2 2 2 2 2 Cellulose 1 1 1 1 1 fibres

Each aerosol-generating article was subjected to the heating testdefined above, at both 360° C. and 280° C. The nicotine level in theaerosol delivered from each aerosol-generating article were measured,with the results shown below in Table 3.

TABLE 4 Nicotine delivery efficiency under two different heatingtemperatures. Nicotine Nicotine Ratio of delivery at % delivery at %MCT:Tobacco 360° C. (mg) change 280° C. (mg) change  0 (Foam M) 1.400.90 1:2 (Foam N) 1.84 30.71% 1.21 34.44% 1:3 (Foam O) 2.75 96.43% 1.81101.11% 1:5 (Foam P)  2.52 80.00% 1.72 91.11% 1:10 (Foam Q)  1.88 34.26%1.25 38.89%

As can be seen in the Table 4, when the aerosol-generatingtobacco-containing compositions are provided in form of a foam or amousse, the efficiency of nicotine delivery is observed to be improvedsignificantly compared to the Example 1. In other words,aerosol-generating substrates in form of a foam would be a preferredoption over aerosol-generating substrates in powder form when the higherrelease rate of volatile compounds such as nicotine is to be soughtafter.

Similar to the Example 1, it has been discovered that lower heatingtemperature i.e. 280° C. is more efficient in releasing volatilecompounds compared to heating aerosol-generating material of the presentinvention at the higher temperature of 360° C. Moreover, the MCT totobacco-containing material of 1:3 gave the highest nicotine deliveryamount, followed by the ratio of 1:5.

These results demonstrated that the use of an aerosol-generatingtobacco-containing material having a medium-chain triglyceride oilincorporated into it provide an increased nicotine or aerosol yieldcompared to a homogenised tobacco material having the same amount oftobacco but without a medium chain triglyceride oil as defined. Thiseffect is furthermore significantly observed when the ratio of MCT totobacco-containing material on a dry basis is between 1:3 and 1:5.

1. An aerosol-generating tobacco-containing composition provided in aform of a foam or a mousse, wherein the composition comprisesparticulate tobacco material and lipid, wherein the lipid ismedium-chain triglyceride, a ratio of the medium-chain triglyceride tothe particulate tobacco material on a dry weight basis is between 1:3and 1:5.
 2. The composition according to claim 1, wherein theparticulate tobacco material has a particle size of less than 100 μm. 3.The composition according to claim 1, wherein the ratio of themedium-chain triglycerides to the particulate tobacco material on thedry weight basis is 1:3.
 4. The composition according to claim 1,wherein the lipid is derived from palm kernel oil or coconut oil.
 5. Thecomposition according to claim 1, wherein the lipid comprises caprylicacid (C8:0), capric acid (C10:0), and/or lauric acid (C12:0).
 6. Thecomposition according to claim 1, wherein over 50 wt. % of the lipid isMCT caprylic acid (C8:0) based on a total weight of the lipid.
 7. Thecomposition according to claim 1, wherein the composition furthercomprises maltodextrin acacia gum, silicon dioxide and/or sunflowerlecithin.
 8. The composition according to claim 1, wherein thecomposition further comprises any of a propellant, an aerosol-formingagent, a foam-stabilizing agent, and/or a foam-forming agent.
 9. Thecomposition according to claim 1, wherein the composition furthercomprises an aerosol-forming agent in a proportion of 10-80 wt.-%,preferably 30-70 wt. % of a weight of an aerosol-generating material.10. A method of preparing an aerosol-generating tobacco-containing foamor mousse, comprising the steps of: a. mixing an aerosol-forming agentand a foam-forming agent under heating into a mixture; b. aerating themixture with a gas or air for at least 5 minutes under room temperature;c. adding to the mixture a tobacco-containing ingredient and/or aninhalable agent; d. adding to the mixture a medium-chain triglyceride,wherein a ratio of the medium-chain triglyceride to thetobacco-containing ingredient on a dry weight basis is between 1:3 and1:5; e. aerating the mixture with a gas or air for at least 5 minutesunder room temperature; and f. adding a foam stabilizing agent.
 11. Themethod according to claim 10, wherein each step of aerating the mixtureincludes aerating the mixture with a heated gas or air of between 35° C.and 50° C. for at least 10 minutes.
 12. An aerosol-generating articlecomprising the aerosol-generating tobacco-containing compositionaccording to claim
 1. 13. The composition according to claim 1, whereinthe particulate tobacco material has a particle size of less than 50 μm.14. The composition according to claim 1, wherein the particulatetobacco material has a particle size of between 40 μm and 90 μm.
 15. Thecomposition according to claim 1, wherein over 66 wt.-% of the lipid isMCT caprylic acid (C8:0) based on a total weight of the lipid.
 16. Thecomposition according to claim 1, wherein the composition furthercomprises an aerosol-forming agent in a proportion of 30-70 wt.-% of aweight of an aerosol-generating material.
 17. The method according toclaim 10, wherein the step of mixing includes mixing a solvent with theaerosol-forming agent and the foam-forming agent under heating into themixture.
 18. The method according to claim 10, further comprisingaerating the mixture with a gas or air after the step of adding to themixture the tobacco-containing ingredient and/or an inhalable agent.